Autofac DbContext已被处置 [英] Autofac DbContext has been disposed

问题描述

我已经阅读了这篇帖子 DbContext已被处置并且是autofac ，但是我仍然遇到相同的错误:

I've read this post DbContext has been disposed and autofac but I'm still getting the same error:

由于已处理DbContext，因此无法完成该操作.

The operation cannot be completed because the DbContext has been disposed.

public class EFRepository : IRepository
{
    private EFDbContext context;

    public EFRepository(EFDbContext ctx)
    {
        context = ctx;
    }

    public TEntity FirstOrDefault<TEntity>(Expression<Func<TEntity, bool>> predicate, params Expression<Func<TEntity, object>>[] includes)
        where TEntity : class, IContextEntity
    {
        IQueryable<TEntity> query = includes.Aggregate<Expression<Func<TEntity, object>>, IQueryable<TEntity>>
                     (context.Set<TEntity>(), (current, expression) => current.Include(expression));            

        return query.FirstOrDefault(predicate);
    }
}

在Global.asax中

And in the Global.asax

ContainerBuilder builder = new ContainerBuilder();
builder.RegisterControllers(typeof(MvcApplication).Assembly);

builder.Register<IRepository>(c => new EFRepository(new EFDbContext()));

ILifetimeScope container = builder.Build();
DependencyResolver.SetResolver(new AutofacDependencyResolver(container));

控制器注入:

public class AccountController : Controller
{
    private readonly IRepository repository;
    private readonly IMembershipService membershipService;        

    public AccountController(IRepository repo, IMembershipService mmbrSvc)
    {
        repository = repo;
        membershipService = mmbrSvc;
    }
    [HttpPost]        
    public ActionResult Login(LoginViewModel viewModel)
    {
        if (!ModelState.IsValid)             
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);            

        string returnUrl = (string)TempData["ReturnUrl"];
        LoginDto accountDto = viewModel.GetLoginStatus(repository, membershipService, returnUrl);
        string accountDtoJson = JsonHelper.Serialize(accountDto);

        return Content(accountDtoJson, "application/json");
    }
}

然后在LoginViewModel中:

Then in LoginViewModel:

public LoginDto GetLoginStatus(IRepository repo, IMembershipService mmbrSvc, string returnUrl)
    {
        repository = repo;
        membershipService = mmbrSvc;

        User user = repository.FirstOrDefault<User>(x => x.Username == Username, x => x.Membership);
    ............
    ............
    }

推荐答案

您需要在AutoFac中注册DbContext本身，并为其赋予适当的生命周期. InstancePerDependency通常适合存储库.

You need to register the DbContext itself with AutoFac and give it the appropriate lifetime. InstancePerDependency is usually fine for repositories.

builder.RegisterType<EFDbContext>().AsSelf().InstancePerDependency();

然后，您不需要给存储库注册一个对象，只需注册类型(记住也要指定生存期):

Then, you don't need to give the repository registration an object, just register the type (remembering to specify the lifetime as well):

builder.Register<EFRepository>().As<IRepository>().InstancePerLifetimeScope();

这篇关于Autofac DbContext已被处置的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！